import java.util.Scanner;

public class Test {
    public static void main(String[] args) {
        String s=" ";
        long start =System.currentTimeMillis();//记时，毫秒
        for (int i = 0; i < 10000; i++) {
            s+=i;
        }
        long end = System.currentTimeMillis();
        System.out.println(end-start);
    }
}
